Description
A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.
CVSS breakdown
CVSS 3.0
Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High
Affected products
- Unknown / kerneln/a – n/a
References
- MISChttp://www.securityfocus.com/bid/106253
- MAILING_LISThttps://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
- MAILING_LISThttps://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
- VENDOR_ADVISORYhttps://usn.ubuntu.com/3932-1/
- VENDOR_ADVISORYhttps://usn.ubuntu.com/3932-2/
- MAILING_LISThttps://lists.debian.org/debian-lts-announce/2019/05/msg00002.html
- VENDOR_ADVISORYhttps://usn.ubuntu.com/3981-1/
- VENDOR_ADVISORYhttps://usn.ubuntu.com/3980-1/
- VENDOR_ADVISORYhttps://usn.ubuntu.com/3980-2/
- VENDOR_ADVISORYhttps://usn.ubuntu.com/3981-2/
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1873
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1891
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2696
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2730
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3309
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3517
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2020:0204
- VENDOR_ADVISORYhttps://www.oracle.com/security-alerts/cpuApr2021.html
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884
- MISChttps://patchwork.kernel.org/patch/10733769/
- MISChttps://patchwork.kernel.org/cover/10733767/
- MISChttps://support.f5.com/csp/article/K21430012